Informatics Publishing Limited

Merin Lizbeth George ¹, C. N. Ravi ¹, R. Harikrishnan ¹, G. R. P. Lakshmi ¹

Affiliations
1 Sathyabama University, Chennai

Abstract

This paper presents electro-thermal modeling using Resistance-Capacitance (RC) for transient heat conduction to inspect temperature variation over the surface of a material (AISI 316 steel) with defective and non-defective zones. An electrical based analytic approach for stepped infrared thermography is presented based on the correspondence between the fundamental laws of heat transfer and electricity. The construction of approximate analogous electrical models of thermal problem has been used in the mathematical analysis of heat transfer. A rigorous discussion of the heat dissipation mechanism over the material is performed, to show that the temperature over the defect region is always greater than the reference area and to prove the analogy of thermal to electrical parameter from the surface temperature evolution.

Keywords

Electro-thermal Modeling, Stepped Infrared Thermography, AISI 316 Steel, Analytic Approach, Analogy

Full Text

   

R. Harikrishnan ¹, V. Jawahar Senthil Kumar ²

Affiliations
1 Electrical and Electronics Engineering, Sathyabama University, Chennai - 600119, Tamil Nadu, IN
2 Department of Electronics and Communication, College of Engineering Guindy, Anna University, Chennai - 600025, Tamil Nadu, IN

Abstract

Most of the real life problems are non linear, non differentiable and multi objective with more constraints. Traditional optimization algorithms cannot find solution or is more complex to find an optimal solution and its complexity increases with the scalability problem. This is the motivation of nature and bio-inspired heuristic algorithms which provide better optimal solution for real life problems. This paper gives an approach of one such bio-inspired algorithm called as group search optimizer localization algorithm integrated with Xbee arduino sensor network, which is used to minimize the localization error of wireless sensor networks. The algorithm is developed from the inspiration of animal food and basic need foraging behavior and is a group based localization optimization algorithm. This employs a resource finding producer and scrounger follower model. Real time data collected by Xbee arduino sensor network is used by group search optimizer localization algorithm to self determine the location information of sensor nodes. Localization in wireless sensor networks is needed to improve the performance, reliability and life time of the network.

Keywords

Anchor Nodes, Group Search Optimizer, Localization, Producer, RSSI, Scrounger, Sensor Nodes, Xbee Arduino

Full Text

   

P. Ponnin Thilagar ¹, R. Harikrishnan ¹

Affiliations
1 Faculty of Electrical and Electronics Engineering, Sathyabama University, Chennai, Tamil Nadu - 600119, IN

Abstract

Voltage profile has been a major concern for power system utilities. Lack of voltage profile control may cause voltage collapse and lead to complete power cut in the system. Several events of voltage collapse in the recent past in the country are some example. Flexible AC Transmission Systems (FACTS) devices are increasingly used to improve voltage profile and power flow control in many utilities. However, owing to the considerable cost of FACTS devices involved, it is important to find the optimal location and sizing of these devices in a power system to obtain maximum benefits of these devices. In the recent works, to find optimal location and sizing of STATCOM, PSO (Particle Swarm Optimization), Genetic Algorithm (GA) and many other intelligent algorithms was used. In this research work new intelligent algorithm known as firefly OPF algorithm is used to find best location and size of STATCOM. The algorithm is implemented for finding optimal location and sizing of STATCOM for voltage profile improvement in a benchmark IEEE 30-bus system.

Keywords

FACTS, Firefly OPF Algorithm, Newton Raphson Method, Optimal Power Flow, STATCOM

Full Text

   

Achutananda Parhi ¹, V. Mahesh ¹, Khadarvoli Kalluru ¹, S. Reshmi ¹, R. Harikrishnan ¹, V. M. Lakshmi ¹, J. Paul Murugan ¹, Renjith Kumar Reddy ¹

Affiliations
1 Vikram Sarabhai Space Centre, Indian Space Research Organisation, Thiruvananthapuram 695 022, IN

Abstract

This article discusses the developmental challenges of the low-thrust, long-duration solid rocket motor for the launch of the experimental Reusable Launch Vehicle-Technological Demonstrator (RLV-TD). The main challenges were: (1) developing a motor case and subsystems with low inert mass; (2) design of an optimum nozzle such that the motor can have maximum specific impulse at atmospheric conditions, but with no flow separation at low operation pressures; (3) developing a slow-burning propellant (3 mm/s) to meet the mission requirements; (4) design of propellant grain for the motor so that it has long burning time, the vehicle experiences low dynamic pressure at the transonic regime, and the motor is without combustion instability; (5) developing necessary thermal protection system to take care of long-duration operations, and (6) developing the igniter to ensure the ignition of the motor, especially when easy ignition is difficult with slow-burning propellants and that there should be sufficient overlap of igniter functioning with motor initiation. Performance of the motor in flight indicated that the design met all the required criteria within the expected tolerance.

Keywords

Burning Rate, Igniter, Motor Case, Performance Prediction, Solid Rocket Booster.

Full Text

   

G. Saravanakumar ¹, R. Harikrishnan ¹, R. Rajesh ¹, R. Suriyaprabakaran ¹, M. Vinoth ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Tamilnadu College of Engineering, Karumathampatti, Coimbatore-641659, Tamilnadu, IN

Abstract

Now a days, Data transmission without using any network is very tedious job to do. In our project, data and audio is transmitted and received through visible lights and control the devices. The data is generated by microcontroller (tx) then transmitted through LED, these data can be received by photo detector and displayed on microcontroller. It is an advanced technology and the accuracy is more. Here, data communication, controlling the devices and as well as transmission of audio through visible light is achieved. Now a day, Wi-Fi is commonly used technology but the radiations are hazardous for human health so Li-Fi is the one which eliminated the wireless technology like Wi-Fi and transmits the data by using light. The security of transmitting the data is more compare to other technology. In industries, for file transmission and data transmission this technology is very useful because without using any networks one can easily transmit the data through existing light. It is user friendly and is cost effective. This technology is also used to control the devices like bulb, fan etc through visible light so that we can avoid the wastage of electricity. The data rate in this technology is faster than 10Mbps.

Full Text

     

K. Sreejith ¹, Shailesh Prasad ¹, R. Bagavathiappan ¹, C. Prasanth ¹, R. Jeenu ¹, J. Paul Murugan ¹, Thomas Kurian ¹, N. Mansu ¹, R. Harikrishnan ¹, G. Levin ¹, V. Eswaran ¹

Affiliations
1 Solid Propulsion and Research Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, IN

Abstract

The Vikram Sarabhai Space Centre, Thiruvananthapuram has developed a special purpose motor for Human Spaceflight Programme with four reverse flow nozzles, having cant angle of 149°, termed as Lowaltitude Escape Motor (LEM). This is a high-thrust short-duration motor having specific envelope constraints. New high burn rate propellant has been developed to achieve the specific mission requirements. In the design, emphasis has been given to smooth turning of internal flow, avoiding sharp edges and corners, to the specified cant angle. It has to satisfy the thermal as well as structural design requirements for the multiple nozzle openings provided, containing itself to minimum external projections and envelope. Since four ellipsoidal-shaped cut-outs from the chamber cause high stress concentrations, welding or some other joining methods are not preferable. The nozzle hardware has to be machined out of 15CDV6 steel forging with high precision. The motor is tested in the vertical mode in order to avoid exhaust gas hitting on the ground and getting deflected back to the motor. This calls for extensive thermal protection requirements for both test stand and motor subsystems. A solid rocket motor with four reverse flow nozzles has been designed, realized and twice static tested successfully. The intricacies involved in the development of LEM are presented in this article.

Keywords

Launch Escape System, Manned Mission, Multiple Nozzles, Reverse Flow, Solid Rocket Motors.

Full Text